Solve for m
m=\frac{4}{5}=0.8
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40=50m
Divide 1680 by 42 to get 40.
50m=40
Swap sides so that all variable terms are on the left hand side.
m=\frac{40}{50}
Divide both sides by 50.
m=\frac{4}{5}
Reduce the fraction \frac{40}{50} to lowest terms by extracting and canceling out 10.
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